High pollution advisory issued with cooldown coming for holidays in Arizona

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High pollution advisory persists through weekend for Phoenix area

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High levels of air pollution increase health risks from heat

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High levels of air pollution hit London and other parts of England

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Quick answers about Ozone High Pollution Advisories

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Air pollution levels in India's capital hit record high

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Delhi in grip of fog with high air pollution

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WHO: Breathe Life - How air pollution impacts your body

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The Secret Cost of Air Pollution

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San Diego has high levels of ozone pollution

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Clean Air Campaign: Small towns have high pollution levels in the evening

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Air Pollution 101 | National Geographic

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High pollution levels may hurt wallets of local businesses

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What makes Delhi's air so deadly

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Valley under Ozone High Pollution Advisory

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India's high pollution levels continue: Anumita Roychowdhury

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How Beijing improved its air pollution

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High pollution advisory for Phoenix area

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Arizona sees first O-zone high pollution advisory of year

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